Staff Answer
Jul 30, 2026 - 05:47 AM
In general, if you are not getting a warning light, it is important to understand that when you measure chlorine in the pool, you are only able to detect the leftover, unneeded amount of chlorine in the water – which is a few steps removed from the system. Without a warning light, the system generates a consistent and precise amount of chlorine according to the output setting you choose and the run time you give it, and if those factors haven't changed but free chlorine levels are going down, then this indicates rising chlorine demand of the water. If you haven't already, turn up the chlorine output, and increase its run time if needed.
If there is no warning light, replacing a cell would not produce different results. If you have a model which properly sized for the pool, and is now needing to be run at 100% output throughout the day at this point, then this typically means there are factors in the water that need to get addressed. Please see this low chlorine troubleshooting guide which will 1) allow you to confirm your system’s generation and then 2) will give more helpful information about correcting issues that can significantly increase chlorine demand (this is common, and unfortunately, many pool stores don’t fully assist with this).
If you are getting a warning light, however, this means the system is not generating chlorine, and the issue should be addressed following the complete RJ-Series troubleshooting guide.
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